Automobile Transmission- Clutch, Requirement of clutch, classification of clutch

CLUTCH

Clutch

An automotive clutch is used to connect and disconnect the engine and manual
transmission or transaxle. The clutch is located between the back of the engine and the
front of the transmission.

Clutch defination:

Clutch is a device to connect driving and driven shafts of a machine, where the driven shaft can be

disconnected almost instantaneously from the driving shaft as desired by the operator or driver

Mechanism which enables rotary motion of shaft to be transmitted to the second shaft axis ,which is coincident with the first.

Working Principle-

A friction clutch has its principal application in the transmission of power of shafts and machines, which must be started and stopped frequently. The force of friction is used to start the driven shaft from rest and gradually brings it up to the proper speed without excessive slipping of the friction surfaces. In automobiles, friction clutch is used to connect the engine to the driven shaft. In operating such a clutch, care should be taken so that the friction surfaces engage easily and gradually brings the driven shaft up to proper speed.

Requirement of Clutch-

1)Torque Transmission

• The clutch should be able to transfer the maximum torque of engine under all conditions.

• Usually designed to transmit 125 to 150% of maximum engine torque.

2) Gradual Engagement:

Clutch should take the drive gradually without occurrence of sudden jerks

3)Heat Dissipation:

During clutch application large amount of heat is generated, the rubbing surfaces should have sufficient area and mass to absorb the heat generated. The design of clutch should ensure proper ventilation or cooling for adequate dissipation of heat.

4)Dynamic Balancing:

This is necessary particularly in high speed clutches.

5)Vibration damping:

Suitable mechanism should be incorporated within the clutch to eliminate the noise produced in transmission

6)Size:

The size of clutch must be smallest possible , so that it occupy minimum amount of space.

7)Inertia:

The clutch rotating parts should have minimum inertia.(Otherwise when clutch plate is released for gear changing, clutch plate will keep on spinning)

8)Ease of Operation:

The operation of disengaging the clutch should be easy for driver.

Classification of Clutch-

Classification of Clutches

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